avrora.core.isdl.ast
Class Literal.IntExpr

java.lang.Object
  avrora.core.isdl.ast.Expr
      avrora.core.isdl.ast.Literal
          avrora.core.isdl.ast.Literal.IntExpr

Enclosing class:

Literal

public static class Literal.IntExpr

extends Literal

The IntExpr inner class represents an integer literal that has a known, constant value.

Nested Class Summary

Nested classes inherited from class avrora.core.isdl.ast.Literal

Literal.BoolExpr, Literal.IntExpr

Field Summary

int	value The value class stores the constant integer value of this literal.

Fields inherited from class avrora.core.isdl.ast.Literal

token

Fields inherited from class avrora.core.isdl.ast.Expr

PREC_A_ADD, PREC_A_AND, PREC_A_MUL, PREC_A_OR, PREC_A_SHIFT, PREC_A_XOR, PREC_L_AND, PREC_L_EQU, PREC_L_OR, PREC_L_REL, PREC_L_XOR, PREC_TERM, PREC_UN

Constructor Summary

Literal.IntExpr(Token v)
The constructor of the IntExpr class evaluates the token's string value to an integer and stores it in the publicly accessable value field, as well as storing a reference to the original token.

Method Summary

Expr	accept(CodeRebuilder r) The accept() method implements one half of the visitor pattern for rebuilding of expressions.
void	accept(CodeVisitor v) The accept() method implements one half of the visitor pattern so that client visitors can traverse the syntax tree easily and in an extensible way.
int	getBitWidth() The getBitWidth() method returns the known bit size of this expression which is needed in computing the size of an encoding.
int	getPrecedence() The getPrecedence() method gets the binding precedence for this expression.
java.lang.String	toString()

Methods inherited from class avrora.core.isdl.ast.Literal

accept, isConstantExpr, isLiteral

Methods inherited from class avrora.core.isdl.ast.Expr

innerString, isBitRangeExpr, isMap, isVariable, tokenToBool, tokenToInt

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

value

public final int value

The value class stores the constant integer value of this literal.

Constructor Detail

Literal.IntExpr

public Literal.IntExpr(Token v)

The constructor of the IntExpr class evaluates the token's string value to an integer and stores it in the publicly accessable value field, as well as storing a reference to the original token.

Parameters:

v - the token representing the value of this integer

Method Detail

getBitWidth

public int getBitWidth()

The getBitWidth() method returns the known bit size of this expression which is needed in computing the size of an encoding. For integer literals, the known bit width is only defined for binary constants (e.g. "0b0101011"), in which case it is the number of bits after the "0b" prefix.

Overrides:

getBitWidth in class Expr

Returns:

the width of this integer in bits if it is a binary literal; an error otherwise

accept

public void accept(CodeVisitor v)

The accept() method implements one half of the visitor pattern so that client visitors can traverse the syntax tree easily and in an extensible way.

Specified by:

accept in class Expr

Parameters:

v - the visitor to accept

accept

public Expr accept(CodeRebuilder r)

Description copied from class: Expr

The accept() method implements one half of the visitor pattern for rebuilding of expressions. This visitor allows code to be slightly modified while only writing visit methods for the parts of the syntax tree affected.

Specified by:

accept in class Expr

Parameters:

r - the rebuilder to accept

Returns:

the result of calling the appropriate visit() method of the rebuilder

toString

public java.lang.String toString()

getPrecedence

public int getPrecedence()

Description copied from class: Expr

The getPrecedence() method gets the binding precedence for this expression. This is used to compute when inner expressions must be nested within parentheses in order to preserve the implied order of evaluation.

Specified by:

getPrecedence in class Expr

Returns:

an integer representing the precedence of this expression; higher numbers are higher precedence